diff --git a/gcc/fortran/module.c b/gcc/fortran/module.c
index 4487f65..b6a4e87 100644
--- a/gcc/fortran/module.c
+++ b/gcc/fortran/module.c
@@ -4568,7 +4568,9 @@ static void
 load_operator_interfaces (void)
 {
   const char *p;
-  char name[GFC_MAX_SYMBOL_LEN + 1], module[GFC_MAX_SYMBOL_LEN + 1];
+  /* "module" must be large enough for the case of submodules in which the name
+     has the form module.submodule */
+  char name[GFC_MAX_SYMBOL_LEN + 1], module[2 * GFC_MAX_SYMBOL_LEN + 2];
   gfc_user_op *uop;
   pointer_info *pi = NULL;
   int n, i;
@@ -4624,7 +4626,9 @@ static void
 load_generic_interfaces (void)
 {
   const char *p;
-  char name[GFC_MAX_SYMBOL_LEN + 1], module[GFC_MAX_SYMBOL_LEN + 1];
+  /* "module" must be large enough for the case of submodules in which the name
+     has the form module.submodule */
+  char name[GFC_MAX_SYMBOL_LEN + 1], module[2 * GFC_MAX_SYMBOL_LEN + 2];
   gfc_symbol *sym;
   gfc_interface *generic = NULL, *gen = NULL;
   int n, i, renamed;
diff --git a/gcc/testsuite/gfortran.dg/pr93486.f90 b/gcc/testsuite/gfortran.dg/pr93486.f90
new file mode 100644
index 0000000..5037d40
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr93486.f90
@@ -0,0 +1,30 @@
+! { dg-do compile }
+! PR fortran/93486
+module ivs
+  interface l
+     module procedure l_
+  end interface l
+contains
+  function l_()
+  end function l_
+end module ivs
+
+module aModeratleyLongModuleName
+  use ivs
+  interface
+     module subroutine cmo()
+     end subroutine cmo
+  end interface
+end module aModeratleyLongModuleName
+
+submodule (aModeratleyLongModuleName) aNameForASubmoduleThatIsVeryLongButWhichIsLegalStill
+contains
+  module procedure cmo
+  end procedure cmo
+end submodule aNameForASubmoduleThatIsVeryLongButWhichIsLegalStill
+
+submodule (aModeratleyLongModuleName:aNameForASubmoduleThatIsVeryLongButWhichIsLegalStill) sb
+end submodule sb
+
+submodule (aModeratleyLongModuleName:sb) sc
+end submodule sc